Ivelina Moteva, Plamen Georgiev
ABSTRACT. The main aim of this study was to assess the effects of ferrous iron oxidation, hydrolysis and precipitation of the ferric iron on the mechanisms of arsenate removal from acid mine drainage. The study was realized at the pH range 2,0 – 6,5. H2O2 was the oxidant used in the chemical test. A mixed culture of mesophilic iron–oxidizing chemolithotrophic bacteria (Acidithiobacillus ferrooxidans, Leptospirillum ferroxidans) carried out the ferrous oxidation in the biological test. NaOH was used as an alkalizing agent which triggered the ferric iron hydrolysis and precipitation. The results showed that the total content of retained arsenic by ferric iron hydrous oxides and its speciation as geochemical fractions depended on the iron and phosphate concentrations in acid solution. The results showed that phosphate concentration lower than 6 mg/ L limited the ferrous iron oxidation rate. At the tested experimental conditions, arsenic sorption by formed ferric iron hydrous oxides was the main mechanism for its removal from acid mine drainage, as the ratio between iron and phosphate determined the proportions between the geochemical fractions of scavenged arsenic.
Keywords: arsenate, ferric iron, ferrous iron oxidation, sorption, fractions
Moteva I., P. Georgiev. Effects of the iron oxidation and precipitation processes on the arsenate sorption and coprecipitation
DOI: 10.5281/zenodo.4270111
DOI: https://doi.org/10.58903/a14161832
References
1. Abdul, K.S., S.S. Jayasinghe, E.P. Chandana, C. Jayasumana, P.M. De-Silva. 2015. Arsenic and human health effects: a review. Environmental Toxicology & Pharmacology 40, 828–846. https://doi.org/10.1016/j.etap.2015.09.016
2. Ali, W., A. Rasool, M. Junaid, H. Zhang. 2018. A comprehensive review of current status, mechanism, and possible sources of arsenic contamination in groundwater: a global perspective with the prominence of Pakistan scenario. Environmental Geochemistry & Health 1–24. https://doi.org/10.1007/s10653-018-0169-x(0123456789().,-volV()0123456789().,-volV)
3. Bowell, R.J., C.N. Alpers, H.E. Jamieson, D.K. Nordstrom, J. Majzlan. 2014. The environmental geochemistry of arsenic—an overview. Reviews in Mineralogy and Geochemistry 79, 1–16. https://doi.org/10.2138/rmg.2014.79.1
4. Dove, P.M., J.D.Rimstidt. 1985. The solubility and stability of scorodite, FeAsO4.2H2O. American Mineralogist, 70:838-844.
5. Cornell, R.M., U. Schwertmann. 2003. Introduction to iron oxides. In: The Iron Oxides: Structure, Properties, Reactions, Occurences and Uses. Wiley-VCH Verlag GmbH& Co, Weinheim. DOI:10.1002/3527602097
6. Georgiev, P., I. Zheleva, S. Groudev, M. Nicolova, I. Spasova. 2017. Effects of some factors on the iron removal from rich-in-iron waste solutions by means of goethite and hematite precipitation processes. Journal of Mining and Geological Sciences, 60, part II, Mining, Technology and Mineral Processing, 131-135.
7. Frau, F., R. Biddau, L. Fanfani. 2008. Effect of major anions on arsenate desorption from ferrihydrite-bearing natural samples. Applied Geochemistry 23, 1451-1466. https://doi.org/10.1016/j.apgeochem.2008.01.006
8. Johnson, D.L., M.E.Q.Pilson. 1971. Spectrophotometric determination of arsenite, arsenate, and phosphate in natural waters. Analytica Chimica Acta 58: 289-299. https://doi.org/10.1016/S0003-2670(72)80005-9
9. Robins, R.G., L.G. Twidwell, D.R. Dahnke, S.F. McGrath, G.H. Khoe. 1991. The solubility of metal phosphates. In: EPD Congress 1991 (Ed. Caskell, D.R.), Minerals Metals and Material Society. Warrendale, PA, 3-26.
10. Singhania, S., Q. Wang, D. Filippou, G.P. Demopoulos. 2005. Temperature and seeding effects on the precipitation of scorodite from sulfate solutions under atmospheric pressure conditions. Metall. Mater. Trans. B 36, 327–333. https://doi.org/10.1007/s11663-005-0062-8
11. Silverman, M.P., D.G.Lundgren. 1959. Studies on the chemoautotrophic iron bacterium Ferrobacillus ferrooxidans. II. Manometric studies. Journal of Bacteriology, 78:326–331. doi: 10.1128/jb.78.3.326-331.1959
12. Tessier, A., P. Campbell, M. Bisson. 1979. Sequential extraction procedure for the speciation of particulate trace metals. Analytical Chemistry, 51, 844-851.
13. Tuovinen, O.H., S.I. Niemelä, H.G. Gyllenberg. 1971. Effect of mineral nutrients and organic substances on the development of Thiobacillus ferrooxidans. Biotechnology & Bioengineering 13, 517-527. https://doi.org/10.1002/bit.26013040
14. Tuovinen, O.H., D.P. Kelly. 1973. Studies on the growth of Thiobacillus ferrooxidans: I. Use of membrane filters and ferrous iron agar to determine viable numbers and comparison with CO2 fixation and iron oxidation measures of growth. Archives on Microbiology 68, 285. https://doi.org/10.1007/BF00409941
15. Zheleva, I., P. Georgiev, S. Groudev. 2016. Adsorption/ desorption of arsenate on/ from goethite and hematite, Annual of University of Mining and Geology “St. Ivan Rislki”, vol.59, II, 137-141.
16. Zheleva, I., P. Georgiev. 2019. Study of adsorption/ desorption of arsenate on/ from goethite-covered quartz sand underflow regime of operation. Journal of Mining and Geological Sciences, 62, 1, 89-94.
17. Wang, H., J.M. Bigham, O.H. Tuovinen. 2006. Formation of schwertmannite and its transformation to jarosite in the presence of acidophilic iron-oxidizing microorganisms. Materials Science & Engineering C 26, 588-592. https://doi.org/10.1016/j.msec.2005.04.009
18. Wenzel, W., N. Kirchbaumer, T. Prohaska, G. Stingeder, E. Lombi E, D.C. Adriano. 2001. Arsenic fractionation in soils using an improved sequential extraction procedure. Analytica Chimica Acta 436, 309 – 323. https://doi.org/10.1016/S0003-2670(01)00924-2
19. World Health Organization. 2001. Arsenic in Drinking Water, WHO Fact Sheet No. 210, Geneva, Switzerland.